Pbi controller described an MVA loss of separation event when a descent clearance was issued; but no...

Attributes
ACN	1142963
Time
Date	201401
Local Time Of Day	1801-2400
Place
Locale Reference	PBI.Airport
State Reference	FL
Aircraft 1
Make Model Name	Cessna Citation Sovereign (C680)
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT

Narrative:

Ten miles south of sua there's obstruction at 1;000 ft MSL. I descended an aircraft to 1;500 ft; our MVA we use in this area should be 2;000 ft. The aircraft got a 'low altitude alert' and was at 1;900 ft descending as he was overflying the obstruction. I issued the low altitude warning and asked pilot to verify he was at 2;000 ft and pilot said 'no; you gave us 1;500 ft'. I told the pilot to climb to 2;000 ft and pilot decided to cancel IFR. Simply forgot the obstruction was there. It would be nice if there was a circle or a better way to highlight the obstruction on the radar map instead of just a little upside down V.

Original NASA ASRS Text

Title: PBI Controller described an MVA loss of separation event when a descent clearance was issued; but not realized by the reporter; additional video map highlights were suggested.

Narrative: Ten miles south of SUA there's obstruction at 1;000 FT MSL. I descended an aircraft to 1;500 FT; our MVA we use in this area should be 2;000 FT. The aircraft got a 'low altitude alert' and was at 1;900 FT descending as he was overflying the obstruction. I issued the low altitude warning and asked pilot to verify he was at 2;000 FT and pilot said 'no; you gave us 1;500 FT'. I told the pilot to climb to 2;000 FT and pilot decided to cancel IFR. Simply forgot the obstruction was there. It would be nice if there was a circle or a better way to highlight the obstruction on the RADAR map instead of just a little upside down V.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Pbi controller described an MVA loss of separation event when a descent clearance was issued; but not realized by the reporter; additional video map highlights were suggested.